METHOD FOR PRODUCING SELF-STANDING PACKAGING BAG, SEALING MEMBER USED TO PRODUCE THE SELF-STANDING PACKAGING BAG, AND SELF-STANDING PACKAGING BAG PRODUCED BY THE METHOD FOR PRODUCING SELF-STANDING PACKAGING BAG

Abstract: a method for producing a self-standing packaging bag includes a pair of flat portions and a bottom portion folded in half into an inverted v shape and disposed in a lower part of the pair of flat portions, that has side seal portions and bottom seal portions, and that has step portions formed due to overlapping of films between two-layer portions in which the pair of flat portions overlap each other and four-layer portions in which the pair of flat portions overlap the bottom portion, the method including: forming bottom seal portions in which regions including at least parts of the step portions are unsealed portions in a first sealing step including heating, pressurizing, and cooling; and sealing the unsealed portions in second and subsequent sealing steps. a sealing member used for the production method, and a self-standing packaging bag are produced by the production method.

Inventor(s): Akio YOUTOU, Yohei KAGEYAMA, Takuro MARUYAMA, Yoshihiro TAKEUCHI

CPC Classification: B31B70/64 (MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER (making wound articles, e.g. wound tubes, ; combined making and filling ))

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